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OPOS Technical Council (OPOS - J) is a technical council aiming at realizing open and diverse POS terminals and productivity improvement of POS application development. Work closely with AROS-UPOS of the US and European OPOS-WG and the National Retail Industry Association (NRF) to develop activities, reflect on the universal specification of POS peripheral unique to the Japanese market, formulated specifications We are doing popularization etc. At the OPOS Technical Council, we issue Japanese version specifications as a result of international unified specification examination. This specification evolves from time to time, and standard specifications of interfaces for almost all devices used in POS are formulated.